When we bought our last 5th wheel, we had a salesman that was an RV'r. He openly admitted that he knew very little about the technical details of the 5'rs we were looking at. But said he could help with some things about them. But would get any answers we needed.
And he added that it was his job to help us find a unit we liked and help us put together a deal that satisfied us and the dealer. He showed us everything we wanted to look at. Pointed out some of the differences with others we looked at. But never pushed us in any way.
After a few hours we had seen all we wanted. And we told him which one we wanted him to work up a price on. And consider the offer on our trade in unit. He came up with some numbers. And we told him we didn't feel that was a price we could accept.
He said...OK then. Tell me what you need to make the deal work. We did. And he asked for a credit card to show we were serious. He came back from his sales manager with a price higher but within reason. Done deal.
But before hand, we knew the models we wanted to look at. And had researched the honest value of our trade in. Pretty much knew where we needed to be to make an acceptable deal. They did better than we expected.